Has anyone solved this? I also have this problem. My provider refers me to nokia.ca and do a software update, which I did, to no avail.
I have the latest software update (V 07.21)
My provider: Fido, aka microcell (Canada)
Note: phone has been debranded
My Opera Mini 5.0 was able to install and operate on my SonyEricsson T715a. That is why I assume it's a configuration problem on my Nokia 6300 handset. The custom browser won't even work on the 6300.
mine works now.
my phone also debranded.
I can install Opera Mini 5 (and few other programs)
but somehow google map doesn't work well.
try downloading Opera mini 5 from your computer, save it to memory card then try again.